From: Moshe Shemesh <moshe@mellanox.com>
Date: Fri, 2 Nov 2018 06:10:49 +0200
Subject: net/mlx5e: RX, Verify MPWQE stride size is in range
Patch-mainline: v4.20
Git-commit: e1c15b62b7015119d3e5915cd2ae3b89d59c2576
References: bsc#1103990 FATE#326006

Add check of MPWQE stride size is within range supported by HW. In case
calculated MPWQE stride size exceed range, linear SKB can't be used and
we should use non linear MPWQE instead.

Fixes: 619a8f2a42f1 ("net/mlx5e: Use linear SKB in Striding RQ")
Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -128,6 +128,8 @@ static bool mlx5e_rx_is_linear_skb(struc
 	return !params->lro_en && frag_sz <= PAGE_SIZE;
 }
 
+#define MLX5_MAX_MPWQE_LOG_WQE_STRIDE_SZ ((BIT(__mlx5_bit_sz(wq, log_wqe_stride_size)) - 1) + \
+					  MLX5_MPWQE_LOG_STRIDE_SZ_BASE)
 static bool mlx5e_rx_mpwqe_is_linear_skb(struct mlx5_core_dev *mdev,
 					 struct mlx5e_params *params)
 {
@@ -138,6 +140,9 @@ static bool mlx5e_rx_mpwqe_is_linear_skb
 	if (!mlx5e_rx_is_linear_skb(mdev, params))
 		return false;
 
+	if (order_base_2(frag_sz) > MLX5_MAX_MPWQE_LOG_WQE_STRIDE_SZ)
+		return false;
+
 	if (MLX5_CAP_GEN(mdev, ext_stride_num_range))
 		return true;